RAID 5 is evil - not only does your controller have to calculate parity, it has to write to all drives to record each write operation (writing the data, then the parity for the data on all the other drives).
RAID 1 is your most cost-effective. Large drives make RAID 1 adequate for most installations.
If you have really large database requirements, then RAID 0 + 1 is your best bet.
And three drive RAID 5 arrays are a total waste - same capacity as RAID 1, but with all the negative write performance penalties and no benifits. If you have three drives, config RAID 1 with the extra drive as a hot spare - you will be much better off...
Very cool whitepaper:
http://eval.veritas.com/webfiles/docs/RAIDirectorWP.pdf
Eric
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. . . . RE: Performance/Raid question large... (~Pippy Nimniobu... 4.May.03) 
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